What is associated with: at 825000 acres texas king ranch is bigger than this us state?

Based on the clue 'at 81 he was the oldest man to sign the us constit...', what is the answer? What is associated with: at 81 this pennsylvanian was the oldest delegate at the 1787 constitutional convention? What is associated with: at 815 am on the 6th of this month in 1945 an atomic bomb was dropped on hiroshima? Based on the clue 'at 82 hes over a foot taller than his best friend ...', what is the answer? Based on the clue 'at 83 this widow of ossie davis received an oscar ...', what is the answer? What is associated with: at 8445 words his inaugural address was the longest thats a little more than 263 words per day… Based on the clue 'at 88 days it has the shortest orbital period of t...', what is the answer? Based on the clue 'at 88 she became the oldest primetime emmy winner ...', what is the answer?